In the early years of PCQA development, some simple point-based FR-PCQA methods are proposed by MPEG, such as p2point [1]} and p2plane [2]}. To further deal with colored point clouds, point-based PSNR-yuv [3]} is carried out. Since the point-level difference is difficult to reflect complex distortions, many well-designed FR-PCQA metrics are proposed to employ structural features and have achieved considerable performance, which includes PCQM [4]}, GraphSIM [5]}, PointSSIM [6]}, etc.
